Live European AQI and a 7-day forecast for 35 cities — turned into a plain-language verdict on when it's actually safe to be outside.
Raw pollutant numbers are hard to read. Aer turns them into a clear verdict, a forecast, and a decision you can act on.
The current European Air Quality Index for 35 cities, with a one-line "great day out" or "take it easy" you can act on immediately.
A daily AQI forecast from a machine-learning model trained on 5.5 years of data — plan the school run or a training session days ahead.
A colour-coded map of the whole country. Find the cleanest air near you at a glance, or compare cities side by side.
Guidance tailored to your profile — general, respiratory-sensitive, or active — with a clear "walk, ventilate, mask, or rest" layer.
Set an AQI threshold and get warned when a saved city crosses it, plus an optional morning air report.
Works without a connection using the last readings, always clearly labelled. Location stays on your device; nothing is tracked.
A clean pipeline: hourly data in, a compared and validated forecast out, a plain decision on screen.
Hourly CAMS/ERA5 data for 35 cities is ingested and stored — pollutants, weather, and the computed European AQI.
A machine-learning model predicts 7 days ahead, measured honestly against naive baselines with walk-forward validation.
The app translates it into a verdict, a colour, and personalised guidance — so you know whether to walk, ventilate, or wait.
The same visual language on every screen — one teal accent, the AQI colour, nothing else competing for attention.
Aer uses the European Environment Agency index — the standard in official use across North Macedonia — not the US scale.
Aer's data comes from the Copernicus (CAMS) atmospheric model via Open-Meteo. Every value is a modelled estimate or forecast, and the app says so on screen — because trusting the number means knowing where it's from.
Free, private, and built for North Macedonia. Coming soon to the App Store.